ABSTRACT
Nucleic acid drugs ha ve received increasing attention and are considered to be potential for the therapy of many diseases such as tumor therapy. This is due to their selective regulation of specific protein expression ，simple sequence design ，easy synthesis and modification ，and clear mechanism of action. However ，nucleic acid drugs have to be delivered by carriers to produce therapeutic effects ，because nucleotides must rely on effective carriers to overcome their limitations and various transmembrane barriers. Currently ，most non-viral nucleic acid delivery carriers have the disadvantage of poor transfection efficiency. The researchers design a series of smart responsive nanocarriers that respond to the pathological environments in vivo or physical stimulations in vitro . By responding to internal special changes such as pH values and redox conditions or to external stimuli such as temperature ，ultrasound，magnetic field and light ，the smart responsive nanocarriers can achieve precise regulation of drug release ，enhance the transfection efficiency of nucleotides in target cells and reduce the toxic side effects on normal tissues and cells. This review summarizes the progress of smart responsive nanocarriers in the field of nucleic acid drugs delivery and introduces the functional design and features of smart responsive nanocarriers. The intent is to provide a reference for the development of nucleic acid drugs and their delivery systems.